Posts Tagged ‘Windows’

Citrix and the ODBC Administrator: Not so perfect together.

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I was tasked with building a test server so that a client could test a new feature in a hotfix that was going to be applied to their software package.  The server is installed with software and configured to look like a mirror of their production box, right down to the hardware on which the software runs and I’ve done this many times before so I didn’t think this was going to be a huge problem.  As soon as that sentence entered my thoughts, I should have known better.

Once the hardware was secured and the OS (Windows Server 2003 SP2) was installed, it was time to get about the business of making this look like the client’s production environment.  Two of the tasks involved in this were…

  1. Installing Citrix so that the client could access the box for testing, and
  2. Adding system DSN’s via the ODBC administrator so that data could be pulled from SQL server to the locally installed database application (to be installed later).

Citrix came first.  Once that was completed, I opened the ODBC administrator and found to my horror that when I either tried to create a new system DSN, the ODBC administrator shut down the second you hit the configure button.  I won’t bore you with the details, but this led to myself and the intrepid I.T. staff I work with running down several plausible, but incorrect and time-wasting paths (A missed Windows software update?  Bad disk cluster?  Bad OS install?  Me being the pawn of  a vengeful supreme being’s sick sense of humor?).  Fortunately, as with so many other things, the interwebs came to our rescue because huddled in an obscure little corner of the web was the solution to our problem.

Once the frustration was vented and our thoughts were collected, we actually did something we should have done from the beginning:  looked at the event logs from when the ODBC administrator failures occurred.  We found this stream of jibberish:

0000: 41 70 70 6c 69 63 61 74   Applicat
0008: 69 6f 6e 20 46 61 69 6c   ion Fail
0010: 75 72 65 20 20 6f 64 62   ure  odb
0018: 63 61 64 33 32 2e 65 78   cad32.ex
0020: 65 20 33 2e 35 32 36 2e   e 3.526.
0028: 33 39 35 39 2e 30 20 69   3959.0 i
0030: 6e 20 75 6e 6b 6e 6f 77   n unknow
0038: 6e 20 30 2e 30 2e 30 2e   n 0.0.0.
0040: 30 20 61 74 20 6f 66 66   0 at off
0048: 73 65 74 20 35 62 62 33   set 5bb3
0050: 31 32 64 65               12de

The key to this mess is this snippet:  5bb312de

This is the address in memory where the access violation is created by the Citrix Virtual Memory Optimization service.  In order to not see this again, you simply turn off that service.


Application installation rights in Windows Server 2003 or Finding a needle is a stack of needles.

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I was trying to upgrade an application, and due to the list of complexities involved in the upgrade process, I had decided that the best course of action was to back up all crtical data, uninstall the previous version,  and then do a clean install of the new version.

Having done this before on the other production boxes we have, and this box being the same model, OS, and Citrix install as the other boxes, I made a horrible mistake… I assumed that it would be the same smooth process as had occurred on the other servers.

So I grab my word doc chock full o’ meticulous notes on how to upgrade this monster, and follow each step to the letter and after about 10 minutes or so, the uninstall goes smooth as silk.  I go to do the re-install and I get this message upon clicking the first executable file:

Windows cannot access the specified device, path, or file.  You may not have the appropriate permissions to access the item.

Upon seeing this, I start to go through in my head the list of usual offenders.

  1. Do I have administrative rights?  Check.
  2. Since this box runs Citrix, did I disable logons for other users and enable installation mode?  Check.
  3. Anything set as read-only that shouldn’t be?  Nope.

At this point, I was damn near befuddled, and when you get befuddled, you theories start getting more and more far fetched.  Starting with “Is my account corrupt?” then after logging on using another admin account and getting the same result, you migrate to “Have the Chinese taken control of my server and they are just toying with me right now?” and culminating with “Am I really doing this or am I just another hairless pig fetus floating in a plexiglass bathtub somewhere deep inside inside the Matrix?”

It was at this point that I decided to call Saulo, one of our intrepid Windows admins where I work.  Working with Saulo is great for several reasons… you can get him on weekends, he knows his shit, etc…. but his specialty in this case is that he can find solutions when all of your mere mortal options have been exhausted.  After some trial and error and research, he found this little nugget of wisdom that I will now impart to you:

  1. Open Internet Explorer (I know.  Seems totally unrelated, but this is Windows, so it’s not supposed to be intuitive.  Just work with me here.)
  2. Go to Tools -> Internet Options.
  3. Select the Security tab
  4. Select Internet and then click the Custom Level button.
  5. In the Miscellaneous section, the Launching applications and unsafe files setting was  set to Disable, which is the root cause of my problem.  To fix this, set it to Prompt (recommended).

This screenshot will show the visual details of the steps shown above.


Alterian Engine 4.1 – ConnectionBroker.exe and Security Groups

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This is just a blurb that I wanted to publish for my sake (so that I could look it up later) and for anyone else who has to install Alterian Studio who will invariably run into the same problem.

The problem: You want to set up a security group so that certain fields in your database are invisible to certain users.  You log onto the management console and set up your group only to find that when you log off of the AMC and start the application, the fields you thought were invisible are still visible.  You clearly saw the  group created and users assigned to it in the AMC when you were building the group.  So what happened?

Here is what happened: When you were logged onto the Alterian Management Console, you were indeed building a security group and assigning users to it.  However the issue lies with where you were building that group.  You were building it in memory.  The AMC does not write to disk until you actually log off of your session.  The other piece to this puzzle is what does the writing.

If you remember, back in the heady days of AMS 2.2, there were 3 parts that made up the essence of Alterian:  Molecule.exe (the interface), Atom.exe (the distributor), and Nucleus.exe (the engine).  Now with AMS 2.5/Engine 4.1 comes some serious performance improvements, and one of the reasons for those improvements is ConnectionBroker.exe, the sort of  ‘traffic cop’ for the multi-tenant environment.  You’ll also remember that in AMS 2.2/Engine 3.1, you needed to use DCOMCNFG to tell the application what account it needs to run under so that proper rights are given for these executables to access folders, write to disk, use network shares, etc.  With ConnectionBroker in the mix, you need to do the same thing, but for ConnectionBroker, this is not done in DCOMCNFG.  ConnectionBroker runs as a service, so configuration happens in the Microsoft Management Console under Services.  Another catch is that changes are not immediate.  When you change a service, you have to stop and then re-start the service for the change to take effect.  By default, ConnectionBroker.exe runs under SYSTEM (the Windows SYSTEM account, not Alterian’s administrative account) which often is not given rights to write data willy nilly all over your server.  Switching to whatever generic Alterian account you use in DCOM usually solves this problem as that account is 1) not accessed by regular users and 2) is an admin level account (Alterian uses ‘nuclog’, but where I work, we make our own account).

Once ConnectionBroker.exe service is set to run under a different account than the default Windows SYSTEM account, you will see the Security Group issue disappear.  Interestingly, this issue does not rear it’s ugly head when creating/editing users themselves.